wait on vs wait upon

wait on

verb
  • To wait for (a thing, or an event to take place). 

  • To provide a service to (someone); to act as a servant to (someone); to serve (someone) as a waiter or waitress in a restaurant. 

  • To wait for (a person). 

  • To fly above its master, waiting till game is sprung. 

  • To be in store for (someone). 

wait upon

verb
  • Synonym of wait on 

How often have the words wait on and wait upon occurred in a corpus of books? (source: Google Ngram Viewer )